Importance

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Abstract

A welding wire contains 0.025 mass % or less C, 1.3 mass % or less Si, 2.0 mass % or less Mn, 10 to 25 mass % Cr, 0.04 to 0.2 mass % N, Al and Ti in amounts (mass %) satisfying the relationship: e-800(x-0.05)2×e-300(y-0.08)2≧0.5, where x and y represent contents (mass %) of Al and Ti, respectively, O in an amount (mass %) satisfying the relationship: z<(x+y-0.01)/0.5, where z represents a total amount (mass %) of oxygen in the welding wire, and the balance being Fe and unavoidable impurities. Gas-shielded welding is performed using the welding wire and a shielding gas containing Ar and at least one of O2 and CO2, wherein, provided that volume % of the O2 and CO2 contained in the shielding gas are p and q, respectively, the shielding gas satisfies the relationships: p≦10; q≦50; and p+q≦(x+y-0.01-0.5 z)/0.0006, whereby a weld improved in high-temperature resistance and crack resistance can be formed.

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First Claim